Rock-drill.



, PATBNTED 0013.23, 190e. H. DBITZ.

ROCK DRILL. APPLICATION FILED JAN. 10, 1905.

2 SHEETS-SHEET 1.

ANo'. 833,875. PATENTBD 00123, 1906.

H. nmz. ROCK DRILL. A PPLIUATION FILED JAN. 10, 1905.

' 2 SHEETS-SHEET 2.k

UNI-TEIDE s'rArEs `HENRYnarra; or

Parisian?n .Rock-Daniel FINO; s335875:

`Td @ZY/whom, tima/ i] con-cenni: y

Be it Aknown that I, HENRY DEITZ, a'citiz'en' A olthejUnited States', residing-inlthe city and county ofy Denver andt State' of" Colorado, have invented certain new and4 useful? Iz'rn# provernents in Rock-Drills; andl do declare the ,following to be a full, clear, and exact' description of:v the invention, such as will enable others skilledin the art to which it appertains to make anduse the saine, refer; ence being had to theaccornpanying drawings, and to the figuresofreference Inarl'ed thereon, `which form apart of this spe'ciiica# tion.

My invention relates to girnproyeinentsiri rock-drills; of'the class' set forth in xPate' 11t"'l\To'.` 7 68,894, issued to me August 30, 1904.

AMy'present invention consists of certain novel features of'constructiona1l'of which trates the part broken away', and

Willbe fully understood'by reference to Athe accompanyingy drawings', 1n" Which` is illustrated an-ernbodirnen`tA thereofl In the drawings, ,Figure lisa section taken y throughla.drill'equippedviith my improve# ments, the'` forward extremity Aofi they ,mechl anism'- being.. broken away'.v Fig. 2g illusi i not shown' in .Figi'vis'a detail'yiew offthe reciprocating,drill-holder or piston. v Fig. 41s asvdetail- View of thel rear cap orclosure ofthe drill-casin illustrating/the ratchet ymechanisrn an thev rifle-bar for rotating'the piston ,or.drill-holder. Fig. 5is aside eleva- I tion. of1ny improvedidrill.

the guide-shell inplace, the suportingrnech# 12.,Hinountedint e cap 13yvhch'c1oses the 'rear endoi1 the' casing.l The rear extremity Y ofv thefrifle-b ar protrudes beyond the ratchet,

, 17,5, located inarecess Vormedin the `yrear ex as shown', at 14, andiengages a iiberwasher specification lcifrettearfr @Patenti mamon mea 'Jan'uafyi 1o, 1965. serial Nb.A 240,516?

rteteaiocti :23; .196cv 1n` the sleeve! Between the j rear" en'dl of the' drill-holder' andr an interiorr` shoulder' 17, formed on'l the sleeve, is" bery Washer, 18.Vv

16 is 1 a'v bushing 19; grved to engage' the rifle-,bar 9* for'the" pnrfiiose of' rotatingI the drillholdrin a" mamif'tliabl willfb readily understood In the rearendof' the'c'asiiig yis 'looateda`bushiiig-2.", Th'ire'ar; end of this bushing is' provided With af; collar 211', lwhich engages a shoulder 22 iront'v and" a rubber buffer' 23'in tliefrear.'v In the rearA of the buffer isl located adisl 2,4,Which'occupies' Manned o n thefb'o'dy: @the casn'gs lmi auilary casing' 25 in is' locatedV aA re; -Ciproeatingiyoke 26, prbvidd .with @s161273 in Which is lplaceda'rnoyable jiir'ralabX'QS,

eraan-g: Crank-Shaft so; AS' ,asfissia-Shaft is' rotated theffyoke'jisfreipro e'd.- This yoke is provided wier 'farsa-ray ma@ rear; wardly prjang'parts 31' and 32; whiirar prov'de'd'witli' central? dl'inngsf'; cninui extrae-mty' and ma rilassarsi-isses 'Oiff the yokechanb ers '34 at their4 opposite" ext'r'e'anuil` ,tiesl These sliiporti'ngl partis 31 and 32 gage correspondlng interior threads forr'ned" Iii'c'atingwith the slffv 2:7' ofthe yoke' 'at' one 'loo IOS

order to prevent the forming of burs projecting beyond the part A of the holder, whereby the removal of the latter from they casing might be obstructed. The difference in diameter between the shoulder 43 and the body part A is suflicient to prevent the formation of burs of such size as to project beyond the body part A. It will be understood that as the shoulder 43 bears against the collar 39 the burs, if any are formed, will be at the said shoulder.

' The collar 38 bears against a shoulder 45, which is of less diameter than the part B of the drill-holder, the latter being reduced, as

shown at 46, between the collar and the part B to prevent the formation of burs at the collar 38, which would project beyond the part B of the drill-holder.

The forward extremity of the casing 6 is provided with a screw-cap 47. In this forward part of the casing is placed a bushing 48, having an integral collar 49, which engages a rubber buffer 50, located between the collar and the cap 47. The rear end of this bushing engages the loose collar 39 to limit the forward movement of the latter during the operation of the machine. The rear part of the bushing 48 is also provided 'with an integral collar 51, which engages a shoulder 52, formed on the casing, whereby the bushing is confined within narrow limits.

The drill bit-or tool 53 is connected with a drill-holder by means of a locking device 54, held in place by a U-shaped bolt 55.

The rear extremity of the drill-casing is provided with a depending hollow part 56, having an interiorly-projeeting part 57, forming shoulders 58 and 59. Within this part 56 is located a feed-nut 60, whose forward extremity is enlarged, as shown at 61, to

' form a shoulder 62. Between theshoulders 58 and 62 is located a rubber buer 63. To the rearward extremity of the feed-nut is applied a washer 64, held in place by a nut 65, screwed upon the rear extremity of the feednut whereby the washer is held in place. Between the washer and the shoulder 59 is located a rubber buffer 66.

The feed-screw 67 passes through the feednut and is journaled in a part 68, suitably connected with the guide-shell, whereby it is relatively stationary. A To the rear extremity of the feed-screw is attached' a handcrank 69 for operating the said screw, whereby the casinginay be moved back and forth on the guide-shell at the will of the o erator.

The rubber cushions interposed etween the forward and rear extremities of the feednut and the casing prevent the vibrationsin- 6o eident to the operation of the machine from being transmitted to the hand of the operator upon the crank of the feed-screw. This construction also prevents injury to the mechanism incident to said vibrations.

Attention is called tothe fact that the drillholder or piston is so constructed that it may be unscrewed from the sleeve 16 and withdrawn` from the casing by pulling it forwardly. To this end the drill-holder is composed of forward, middle, and rear parts A, B, and C of different diameters, which makes yit practicable to form the shouldered parts of the drill-holder of less diameter than the parts A and B immediately forward of them, whereby the formation of burs is prevented that otherwise might prevent the removal of the drill-holder from the rear, as heretofore explained.

It is often desirable to remove the piston or drill-holder 7 without taking the machine apart. In this event it is necessary to unscrew the drill-holder from the sleeve 1.6. In order to prevent this sleeve from turning during the operation of unscrewing the drillholder therefrom, I drop a pin 5l into regis-l tering openings formed in the casing, the sleeve 20, and the sleeve 16. This locks thc last-named sleeve against rotation and allows the removal of the drill-holder or piston under the circumstances above stated. This pin 5ri is therefore not used when the machine is in operation, its only function being as above stated. The pin would of course be left inplace when the drill-holder is again inserted and until the latter is screwed to position in the sleeve 16.

From the foregoing description the use and operation of my improved machine will be readily understood. As the crank-shaft 30 is rotated the crank 29 imparts a reciprocating movement to the yoke 26, which, acting on the collars 37 and 38, imparts a corresponding movement to the drill-holder tirough the instrumentality of the springs and collars 39 and 40, as will be readily understood.

As the drill-holder is moved forwardly to 'cause the drill bit or tool to act upona rock it has no rotary movement; but during its rearward stroke the rifle-bar imparts the necessary rotary movement. The operator through the instrumentality of the feedscrew moves the drill-casing back and forth upon the guide-shell for the purpose of bringling the drill-casing into the proper relative position with reference to the breast of the rock.

Attention is `called to the fact that the sleeve 16 where it is engaged by the collar 40 is provided with a reduced part 16u to prevent the loose collar from upsetting the sleeve during the operation of the drill.

Having thus described 'my invention, what I claim is- 1. In a rock-drill, the combination with a guide-shell, casing, and reciprocating yoke, of a drill-holder mounted in the casing, collarsloosely mounted on the holder and engaged by the yoke which is located between them, springs surrounding the drill-holder the yoke, the foremost collar and the rear the spring extremities remote from the yoke, Y

the foremost collar and the rear yoke-collar en aging shoulders on the drill-holder, the col ars being in the rear of the shoulders and the portion of the drill-holder immediately forward of each shoulder being reduced for the purpose set forth,

2. In a rock-drill, the combination With a guide-shell, a casing, and a reci rocating. yoke, oi a drill-holder mounted in t e casing,

collars loosely mounted on the holder and vengaged by the yoke Which is located between them, springs surrounding the drillholder and engaging the yoke-collars, other collars surrounding the drill-holder and engagingthe spring extremities remote from yoke-collar. engaging shoulders on the `drillholder.

3. In a machine of the class described, the

combination of a casing, a drill-holder, a

sleeve located in the casing in ywhich the rear extremity of the drill-holder is threaded, a rifle-bar nut carried by the sleeve,I the casing and sleeve being provided With registering openings, and a locking-'pin' adapted to en- 1 gag? said openings whereby the sleeve is. loc

ed 'against rotation While removing and inserting the drill-holder or piston, substantially as described. Y

In testimony whereof I aiiix my signature in presence of tWo Witnesses.

' HENRY DEITZ. Witnesses:

DENA NELSON, v A. J. OBRIEN. 

